William h



l a To allnchom itkmayconcern.-

` Beit known that I, WILLIAM H. IvENs, of Tren ton, in Mercer county, and State of New Jersey, have WILLIAM II. IVENS, OF TRENTON, NEW JERSEY.

Letters Patent No. 100,411, dated March 1, 187 0.

' STEAM-GENERATOR.

'lhe Schedule referred to in these Letters Patent and making part ci the same.

invented certain new and useful Improvements in Steam-Generators;7 and I" do hereby declare that the following is a full, clear, and exact description thereof', reference being had to the accompanying drawing through `letters of reference marked thereon, forming part ot' this specification, and in which- Figure 1 represents an elevation of a lboiler coustructed according to my improvement. i

Figure 2 is a vertical section taken through the center oft-he same.

4 Figure 3 lis a horizontal section taken on the line :v :con iig. 2.

Figure 4, a similarsection at the line z s( ou fig. 2.

.The same letters indicate like parts on all the iigures.A

'Ihe object of this invention is to produce a boiler that will generate more steam in proportion to the consumption of fuel, raise it toa given pressurein less time, and may, consequently, be 'constructed lighter and more.. portable to accomplish the Ysame amount of work.

Referring to the-drawing, it will be seen that the boiler consists of a fire-chamber, A, having anannular water space, a, around it, and'between the lower and middle line sheets at af alsoof a .water and steamchamber, B, of somewhat similar size and shape ex'- ternally.

'Ihe water spaces of these two chambers are connected by a series of tubes c, which terminate in the two middle iine sheets, and form means oi' circulation for the water and steam. The outer circle of these tubes 4c has also a smaller tube oi' correspondinglength suspended within it, the object of which will.hereinai'ter appear; all the tubes c, except the outer circle, have a smaller pipe passing through'each, which extend to andare secured at their ends inthe upper .and lower sheets b d of the boiler, and these constitute ilues for the passage of the products of comp bustion, which, after escaping attheir upper end are caused to descend in the directionof the arrows, and pass between and around the'tubes, c, which each cor;- tain an annularcolunm of water, through the` openings e near its bottom in the smoke-stack C, which is also surrounded by an annular column of water within a cylinder of coxrespondingflength with that of the pipes c, and similarly connected with the two middle ilue sheets of the chambers A B.

'Ihe chamber B, and the waist or tubular portion of the boiler are encased by a jacket, D, at the lower portion of which is formed an annular water-chamber, g, which serves to heat the feed water'before being forced into the boiler, and above the said chamber, within this jacket D, is, or may be, an extension, E, to

aiiord additional steam space.

A perforated disk, h, or other suitable device may be applied to the jacket D, for controlling a series `of holes for the admission of air, if necessary, to render combustion more perfect, the sparks being arrested by a wove wire, l, near the upper edge of the chamber B, where they are entirely consumed. This jacket renders the boiler Acomplete for portable purposes, but Y when used as a stationary boiler it may be dispensed with and masonry substituted therefor.

The advantages of this construction of boilers are, that the products of combustion are retained iu contact with a smaller quantity of water, and for a longer time in their passage from the fire surface to the outletV ofthe stack, consequently the caloric is more perfectly absorbed'by the water, and an increased eliect fis the result from the same consumption of fuel, and

the difficulty heretofore experienced in boilers having large heating surface, and containing but little water in` proportion thereto, of want of `circulation downwardl y, is remedied iu this construction.

rI he application of the heat through the center and around the outside of an annular column of water will cause a continual upward current, so that it becomes necessary to provide for a downward current to keep up the circulation, which I accomplish by insert-ing water tubes n through the outer circle of tubes c', to the outer surface only of which latter the` heat is applied, so that a downward current'through these innertubes will be the result, and a perfect circulation insured thereby.

What I claim as new, and desire to secure by Iactters Patent, is-

1. Thecombination and arrangement of the chambers A B and water and flue tubes c and c', and oirculating-tubes c and n, substantially as set forth.

2. The extension of the smoke-stack G downwardl through the boiler to near the lower ilue sheet d, and

surrounded by au annular water-chamber s, having lateral openings or flues e through the latter, in combination with the annular water-tubes c, substantially as specified.

3. The arrangement and combination of the jacket D, provided with an annular water-heater, g,I with the dues e, smoke-stack G, annulaiwater-pipes c c', audwater-chambers A B, as shown and described.

4. A steam-generator, the waist portion of which is made up of a series of tubes, forming fines, surrounded by annular columns of water, as shown and described.

5, The combination of .the perforated disk l1, with the jacket D, and recticulated spark-arrester l, airan ged for operation essentially as shown and described. Y

i WM. H. IVENS.

\ Witnesses Grao.l HALE, `W.` Monms SMITH. 

